The War Department Collection of Confederate Records consists of records of the Confederate States of America acquired by capture or surrender at the close of the Civil War and those later acquired by donation or purchase. On July 21, 1865, the Secretary of War established a unit in the Adjutant General's Office for the collection, safekeeping, and publication of the "Rebel Archives." The records were used in protecting the U.S. Government against claims arising from the war, in establishing pension claims, and for historical purposes. After many changes both in location and custody, the records were placed in the Organization Records Section of the Old Records Division of the Adjutant General's Office, from which they were transferred to the National Archives in 1938. Certain federal records relating to Confederate soldiers, maintained with the Confederate records and in part interfiled with them, are included in this record group. Also included are records created by the custodians of the records.
I don't see any method of indexing that follows the reference you quoted though. Maybe someone at the archives could explain it.
Clay Lord
crescentregiment@comcast.net